Can’t wait to get it back!! Looks and runs awesome!

Kevin does a really good job at adding the adjustable H jet. He did mine too. Great video Joe.

@w6qd

Жыл бұрын

Why doesn't the carb have a high jet? Does it run fat?

@phogelbice

Жыл бұрын

Rev limited that way I think.

@johndunbar2393

Жыл бұрын

@@w6qd From my understanding, it's an EPA thing. They rev limited them, this older one to 12.5k and the new ones to only 9.6k rpms and then made it so you can't adjust the H jet, from the factory, to keep people from running them up. Which is looked at as bad for the environment, or whatever. They do tend to run fat with the fixed jet, but I don't know if it's different for different countries, or regions, or what. From what I was told, the fixed H jet, provides fuel for both the low jet and the high jet, even after the adjustable H jet is added.

@mitchell5828

10 ай бұрын

Can you post Kevins contact? Thanks

Cool lol love the big bores

It is making as much power at 5500 RPM now as it did stock at the peak.

That new power curve you built looks phenomenal

That's a lot of saw. Impressive results.

@dynojoemods2764

Жыл бұрын

They are huge. Thank you

Hey Joe Been away from your channel for awhile. Had to pop in and see this build. It’s a beast. That thing could lug all day on an Alaskan mill and throw chips like a wood chipper. Good to see you getting back on the bench again!! God bless Andy Jones

@dynojoemods2764

Жыл бұрын

Glad you made it back. Should make a nice stout saw.

I have the crank install tool for the 372 and I’ve been able to adapt it for many saws. It’s worth every penny. It’s so nice having the proper tools for that stuff

@dynojoemods2764

Жыл бұрын

Makes it very nice indeed. I bought the entire kit, is east to forget which piece goes where.

That's a monster. Thanks for posting the video.

Dang an 880 last week now a 3120 this week

Thank you Joe!

What a nice build, great gains made. Kudos, you do some very nice work.

What a workhorse! More than stock peak power over a 5000 rpm powerband.

Awesome job on the 3120! 🤩🤩

I’ve heard several times of a 3120 eating that same intake screw. Very weird.

Looks like Mathew Olson's case tools ,

@dynojoemods2764

Жыл бұрын

Indeed, great toolset

I just did one Joe I have all the same tools boy did they make the job so much easier....... The customer wanted it painted Alpine green

@dynojoemods2764

Жыл бұрын

Green 3120 would be pretty neat!

Excellent job !

There should be an inexpensive way to change the rod for a stronger Rod setup on the 3120

You do Nice Work Joe. Thanks for sharing.

@dynojoemods2764

Жыл бұрын

Thank you

Nice work Mr. J - it's pretty common for that anchor screw in the manifold to come out and work its way inside the engine - I've seen many of them in that condition.

@cajun3197

Жыл бұрын

Wish we had a book with every one of your posts with everything you’ve seen go wrong with a saw. Would be better than the manufacturer repair manuals

@jasonjenks2609

Жыл бұрын

@@cajun3197 I haven't seen it all but I've seen a lot of what can go wrong with a two cycle motor. Of course, the motorcycle guys deal with far worse sometimes...

Nice work Joe :)

Nice saw!

That's a really clean build and awesome gains! Good job Joe!

@dynojoemods2764

Жыл бұрын

Thank you!

@ragercrepair9301

Жыл бұрын

@@dynojoemods2764 you're welcome!

Mr. Joe always putting down more then exceptional power! Very nice work as always!

@dynojoemods2764

Жыл бұрын

Thank you

Wow what a hoss i absolutely love it!!!

This was a good video Joe

Nice work 👏. You make it look easy.

@dynojoemods2764

Жыл бұрын

Thank you

Sick saw!

love me some 3120!

Those gains........ 🙌

Wicked gains. Be a big difference in wood. 😎👍

Hey Joe. I have essentially identical porting numbers (within 0.10 degrees) on my 3120xp as you are describing here, except my intake duration is less (135.8 deg vs your 142 deg) and my squish is tighter at 0.580mm (0.0228") compared to your 0.027" squish, with a calculated compression ratio of 8.94:1. I've also enlarged and radiused the lower transfers and slightly widened the uppers, widened and radiused the exhaust port sides, and widened the intake just a little to take off the internal side 'ears.' Also lightened the piston and massaged and polished the piston windows and Al-Ox - media-blasted the underside of the deck and internal skirts to create more surface area for piston-cooling, and coned the ID ends of the piston pin, all to reduce reciprocating mass by about 21g. Cold spark using B10HS. She runs like a raped ape, but smooth as silk and cool with NE 93 octane and Maxima K2 at 24:1. Your ported saw has a torque dip just after 8400rpm. How would you go about reducing that torque dip through 9600rpm? I'm thinking my intake duration should be a bit longer? This is not a race saw, just trying to maximize power with reliability. Thanks -doug

@dynojoemods2764

Жыл бұрын

Main way to move the torque up higher is to add some duration. But all the other little tricks you have done will definitely change the powerband some. Sounds like you did a great job!

Wow and she fired strait up after rebuild ,I am impressed.nice work,and yes your right ,it’s whole lot of saw a 3120.remember swinging one of them in 1997 and I was fit and strong then .🦾

That thing is a monster 😱 !!! U can chase Leatherface with that thing

@dynojoemods2764

Жыл бұрын

They are a whole lot of saw for sure.

Beast

What a beast! 👍👍👍👍🇺🇸🇺🇸🇺🇸🇺🇸🙏🙏🙏🙏

Now I know who you remind me of -Jesse James of chainsaws

@dynojoemods2764

Жыл бұрын

Thank you

I’d love to see you port a makita 5000p

👍

Um…. Wow!

Got some gravity in it, should run mine more

@dynojoemods2764

Жыл бұрын

They are fun to run 5 min at a time lol

To jest moc 3120 i 395xp i ms 661💪

👍🏻👏

Buenos videos no sé si en Colombia se consigue este motor

Jug install wo gasket?

Thank you so much for these! How much power increase do you think the machining work (lathe squish etc) added vs what the porting work added?

@RyanMcIntyre

10 ай бұрын

Most of the torque gains are going to be from the increased compression. The porting raised the peak efficiency RPM, and any increase in RPM will increase horsepower.

Love your videos! What do you recommend for breaking in a new saw?

@dynojoemods2764

Жыл бұрын

Good fuel, oil and a sharp chain. Just run them as you plan on using them. Make sure the tune is safe, and enjoy cutting.

Hello my friend.its easy to make a video with 3120 carb to install H screw?

put an 272 coil on it fr fr pliiiiiizzzzzzzzzzzzzzzzzzzz

Would you rather get a brand new saw to port or one that's ready for a rebuild?

@dynojoemods2764

Жыл бұрын

I really like new saws. Clean is everything. Good running clean used is next then full rebuilds last.

@bluffsidetreeservice

Жыл бұрын

@@dynojoemods2764 I've been planning to try and get a 2511t sent to you sometime! Have a few brand new for spares and a few with way more hours than I expected them to last!

What kind of loctite are you using? I don't really want to use red unless you say it's ok

@dynojoemods2764

Жыл бұрын

I use a blue often, unless I really don't want it to come out, then red.

@Revellersaws

Жыл бұрын

I bought blue for muffler bolts but noticed the temp rating is low, so I did the right thing.....and started building a different saw.

@Revellersaws

Жыл бұрын

By the way, I think it's amazing the way you put real numbers to all the he-said he-said business of saws, I appreciate it.

Berapa harga cilinder hsq 3120 bos. Apa ada merek yang murah.

these big saws definitely don’t make sense stock, i noticed that in one of your earlier videos the stock 395 made 7.8 hp stock and the 3120 was 7.7hp the torque was 4.4 on the 395 and 4.8 on this 3120 so your simply gaining a little bit of torque for a saw that weighs a lot more.

@davewyatt1468

Жыл бұрын

but ported i can see massive benefits!!!!!

@dynojoemods2764

Жыл бұрын

Hp wise stock for stock the big saws don't make it. But they do make the tq to make up for it. The numbers listed in the box are taken close to peak power rpm. To get the true peak tq you have to follow the line back and read the scale.

@davewyatt1468

Жыл бұрын

@@dynojoemods2764 good point.

@JoshNoss

11 ай бұрын

​@@davewyatt1468I was just saying something similar as I just watched a dyno of the 592xp where it made 8.6hp and 5.2tq effectively outdoing the bigger 3120 in both HP and torque

i like to get a new carb with hi screw can you sell me one

Gee 7hp is a little disappointing for a 120cc stock 3120. But ported 11hp is very respectable.

@w6qd

Жыл бұрын

Agreed. For the DynoJoe's MS880 build, the 880 had 10.81-HP, 6.85-TQ out of the box and 12.84-HP and 8.14-TQ ported. Both torque and HP appears lacking in the 3120.

@dynojoemods2764

Жыл бұрын

That 880 had a muffler mod and high flow air filter, I have a feeling a 100% stock 880 will be in the 8-9hp range.

Do you sell any of your ported saws Joe?? Would love to have a ported saws from you to the UK... theres not many porters over here

@dynojoemods2764

Жыл бұрын

Sometimes I will list them for sale on the website

@oOdanxOo

Жыл бұрын

@@dynojoemods2764 ah ok, do, ill keep my eye out. you ever build saws to order?

@dynojoemods2764

Жыл бұрын

@@oOdanxOo Yes, can do that as well.

@oOdanxOo

Жыл бұрын

@@dynojoemods2764 do you have a link to your website or email please. Thanks Dan

@dynojoemods2764

Жыл бұрын

@@oOdanxOo Worksaws.com

Those are really expensive to build from what I’ve been told.

@1u5t1n

Жыл бұрын

They are. Just checked the prices on this and that.

@Revellersaws

Жыл бұрын

They are expensive to carry around too, costs 3 times as many soreshoulderbucks as a 372

Nice rebuild & gains man. 🤌 After that teaser video, I want more of that 579 build!

@dynojoemods2764

Жыл бұрын

Working on it, waiting for the mailman to drop of the saw for mock/install

@dynojoemods2764 Reckon what gains would be had with the adjustable carburetor, 272 coil, and a muffler mod but no porting? Just got a 3120 and those are the mods I've performed.

@dynojoemods2764

7 ай бұрын

They dont really add power, but just help fully use the power available.

@JesseWright68

7 ай бұрын

​@@dynojoemods2764 Would you recommend any porting for a saw used exclusively for milling? Thanks!

@dynojoemods2764

7 ай бұрын

@@JesseWright68 A large muffler mod goes a long way for a milling saw. I have done a few 3120 milling port jobs and the customers were very happy

@JesseWright68

7 ай бұрын

​@@dynojoemods2764That one in the video looks like a real hoss for sure!

nice build joe can you send me kevins number so i could get a few 3120 carbs done cheers bud

@dynojoemods2764

Жыл бұрын

Will do.

@vinzer8808

Жыл бұрын

Wonder if you boys have tried swapping out 3120 main jet to smaller ones like 288s or something, hoping it'll be still a little rich but not too much like stock. Drilling those H jets and fitting a new one is pain in the butt